81375902 has 8 divisors (see below), whose sum is σ = 123272712. Its totient is φ = 40285000.

The previous prime is 81375893. The next prime is 81375907. The reversal of 81375902 is 20957318.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81375907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201224 + ... + 201627.

It is an arithmetic number, because the mean of its divisors is an integer number (15409089).

Almost surely, 2^81375902 is an apocalyptic number.

81375902 is a deficient number, since it is larger than the sum of its proper divisors (41896810).

81375902 is a wasteful number, since it uses less digits than its factorization.

81375902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402954.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 81375902 is about 9020.8592717102. The cubic root of 81375902 is about 433.3431525717.

The spelling of 81375902 in words is "eighty-one million, three hundred seventy-five thousand, nine hundred two".